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Impaired_Lakes_2024
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202073.089672
735845.329625
4470986.854175
4822673.759481
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Projected
GCS_North_American_1983
Linear Unit: Meter (1.000000)
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Iowa's 2024 Listing of Clean Water Act Section 303(d) and 305(b) Impaired Streams
vector digital data
2020-03-02
2020-02-27
20180206
Daniel Kendall
Iowa Department of Natural Resources
Geologist 2 – Ambient Lake and Beach Monitoring Coordinator
[From Metadata Record] Daniel Kendall
[From Metadata Record] Daniel Kendall
Wallace State Office Building 502 E. 9th St
Des Moines
Iowa
50319
daniel.kendall@dnr.iowa.gov
US
515-725-8379
[From Metadata Record] Daniel Kendall
Roger Bruner
Iowa Department of Natural Resources
Water Quality Monitoring & Assessment Section - Supervisor
[From Metadata Record] Roger Bruner
[From Metadata Record] Roger Bruner
Wallace State Office Building 502 E. 9th St
Des Moines
Iowa
50319
roger.bruner@dnr.iowa.gov
US
515-310-0247
Jamie Mootz
Iowa Department of Natural Resources
Water Monitoring Data Analyst
Wallace State Office Building 502 E. 9th St
Des Moines
Iowa
50319
jamie.mootz@dnr.iowa.gov
US
515-725-8382
[From Metadata Record] Jamie Mootz
Andy Asell
Iowa Department of Natural Resources
Watershed Improvement Section - Geographic Information Systems Analyst
Wallace State Office Building 502 E. 9th St
Des Moines
Iowa
50319
andy.asell@dnr.iowa.gov
US
515-725-8386
[From Metadata Record] Andy Asell
[From Metadata Record] Andy Asell
Ken Krier
Iowa Department of Natural Resources
Water Quality Monitoring & Assessment Section - Environmental Specialist
Wallace State Office Building 502 E. 9th St
Des Moines
Iowa
50319
Ken.Krier@dnr.iowa.gov
US
This digital, geographically referenced data set was developed by the Iowa Department of Natural Resources to carry out agency responsibilities related to management, protection, and development of Iowa's natural resources.
<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>This dataset contains line work that representing streams and rivers listed as "impaired" in Iowa's 2024 Section 305(b) Water Quality Assessment and the 303(d) Impaired Waters Report. Together, these two reports are known as Iowa's 2024 Integrated Report. Waterbodies in Iowa each have specific designations based on what they are commonly used for-recreation, such as swimming or fishing; drinking water; or maintaining a healthy population of fish and other aquatic life. Every two years, Iowa must report on its progress in meeting water quality goals to the U.S. Environmental Protection Agency (EPA). The state prepares one report called the 305(b) Water Quality Assessment or 305(b) list. This 305(b) list categorizes waterbodies to reflect: those that meet all the designated uses (category 1), those in which data availability is insufficient to determine whether any or all designated uses are being met (categories 2 and 3), and those waters in which the water quality prevents it from fully meeting its designated use, and is thus considered "impaired". New impairments (or category 5 listings) are placed on the "303(d) Impaired Waters Report", commonly referred to as the "impaired waters list." This is named after section 303(d) of the Federal Clean Water Act and means that the stream or lake needs a water quality improvement plan written (also known by a technical name, "Total Maximum Daily Load," or "TMDL"). The water quality improvement plan outlines water quality problems, identifies sources of the problem(s), identifies needed reductions in pollutants and offers possible solutions. Water quality improvement plans are approved by the EPA and then the waters are moved from the 303(d) list back to the 305(b) list as category 4 listings (waters considered impaired, but a water quality improvement plan has been written).</SPAN></P></DIV></DIV></DIV>
EPA Place Names
2015-01-31
https://ofmpub.epa.gov/sor_internet/registry/termreg/searchandretrieve/taxonomies/search.do?search=&searchString=&taxonomyName=WBT%20-%20Geographic%20Locations
Web Taxonomy - Geographic Locations
Iowa
United States
User
2018-02-05
ADBNet
Clean Water Act
Impaired Waters
Iowa DNR
Section 303(d) Impaired Waters Report
Section 305(b) Water Quality Assessment
Water Quality Assessment
<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>CC0 - Public Information</SPAN></P></DIV></DIV></DIV>
Daniel Kendall
Iowa Department of Natural Resources
Geologist 2 – Ambient Lake and Beach Monitoring Coordinator
[From Metadata Record] Daniel Kendall
[From Metadata Record] Daniel Kendall
Wallace State Office Building 502 E. 9th St
Des Moines
Iowa
50319
daniel.kendall@dnr.iowa.gov
US
515-725-8379
[From Metadata Record] Daniel Kendall
Jamie Mootz
Iowa Department of Natural Resources
Water Monitoring Data Analyst
Wallace State Office Building 502 E. 9th St
Des Moines
Iowa
50319
jamie.mootz@dnr.iowa.gov
US
515-725-8382
Ken Krier
Iowa Department of Natural Resources
Water Quality Monitoring & Assessment Section - Environmental Specialist
Wallace State Office Building 502 E. 9th St
Des Moines
Iowa
50319
Ken.Krier@dnr.iowa.gov
US
[From Metadata Record] Ken Krier
GIS Section
Iowa Department of Natural Resources
GeoSpatial Administrator
[From Metadata Record] Casey Kohrt
319-335-1353
[From Metadata Record] GIS Section
Water Quality Assesment Section
Iowa Department of Natural Resources
daniel.kendall@dnr.iowa.gov
502 East 9th St.
Des Moines
IA
50319
Feature Class
2024
15.745
https://geodata.iowa.gov/dataset/impaired-waters-iowa
GIS Section
Iowa Department of Natural Resources
GeoSpatial Administrator
[From Metadata Record] Casey Kohrt
319-335-1353
dataset
EPSG
6.13(3.0.1)
0
Simple
FALSE
0
TRUE
FALSE
Impaired_Lakes_2024
Feature Class
0
Point
Producer defined
OBJECTID_1
FID
OID
4
10
0
Internal feature number.
Esri
Sequential unique whole numbers that are automatically generated.
Shape
Shape
Geometry
4
0
0
Feature geometry.
Esri
Coordinates defining the features.
Name
Name
String
254
0
0
lakeCode
lakeCode
String
254
0
0
LatDD
LatDD
Double
8
38
8
LongDD
LongDD
Double
8
38
8
OBJECTID
OBJECTID
Integer
4
10
0
Internal feature number from previous process
Producer defined
AssessID
AssessID
Integer
4
10
0
SegID_1
SegID_1
Integer
4
10
0
ADB_Code
ADB_Code
String
254
0
0
Unique segment ID code (string) for waterbody segments in Iowa DNR’s ADBNet applications https://programs.iowadnr.gov/adbnet/. The ADB Code was formed by concatenating the first 10 characters of the “Legacy ADB Code” with the field “SegID”, then removing the first 3 characters (i.e. removing “IA “).
Producer defined
Cycle
Cycle
Integer
4
10
0
Cycle of the waterbody assessment
Producer Defined
SegID
SegID
Integer
4
10
0
Unique waterbody segment ID (long integer) of the waterbody as assigned in Iowa DNR Spatial Database Engine
Producer defined
ADB_Name
ADB_Name
String
254
0
0
Waterbody segment name as entered into ADBNet
Producer defined
Acres
Acres
Double
8
38
8
Status
Status
String
254
0
0
Status of the assesment
Producer Defined
WBType
WBType
String
254
0
0
Waterbody type for Segment
Producer defined
Desig_Use
Desig_Use
String
254
0
0
Use Assessment and Use Attainability Analysis (UA/UAA) designated use of the waterbody segment. UA/UAA designated use types and the codes displayed in this data field are listed in Section B of the Iowa DNR’s Water Quality Monitoring and Assessment Section’s “Surface Water Classification” at http://www.iowadnr.gov/Portals/idnr/uploads/water/standards/files/SWC%20-%20Final%206_17_15.pdf
Producer defined
Support
Support
String
254
0
0
Degree to which the assessed use is supported. Iowa DNR continues to follow the assessment protocol in U.S. EPA (1997) of tracking of the degree to which the assessed use is supported: fully, partially, or not supporting. In addition, a magnitude of impairment (slight, moderate, or severe) is identified for each cause of impairment. This information is useful for improved communication on the relative severity of water quality problems and for prioritization for TMDL development. Information on the degree of impairment and on the magnitude of the cause of impairment is available in Iowa DNR’s Assessment Database (ADBNet). Iowa DNR uses the following impairment levels:
Producer defined
PS
Partially Supported. A slight to moderate impairment suggested by occurrence in the lower impairment range.
Section B of the Iowa DNR’s Water Quality Monitoring and Assessment Section’s “Surface Water Classification” at http://www.iowadnr.gov/Portals/idnr/uploads/water/standards/files/SWC%20-%20Final%206_17_15.pdf
NS
Not Supported. A severe impairment suggested by occurrence in the middle to upper impairment range
Section B of the Iowa DNR’s Water Quality Monitoring and Assessment Section’s “Surface Water Classification” at http://www.iowadnr.gov/Portals/idnr/uploads/water/standards/files/SWC%20-%20Final%206_17_15.pdf
Category
Category
String
254
0
0
Integrated Report subcategories. The first number reflects:
- Category 4: Waterbody is impaired or threatened but a TMDL is not needed.
- Category 5: Waterbody is impaired or threatened and a TMDL is needed
"Methodology for Iowa’s 2016 Water Quality Assessment, Listing, and Reporting Pursuant to Sections 305(b) and 303(d) of the Federal Clean Water Act." at http://www.iowadnr.gov/Portals/idnr/uploads/watermonitoring/impairedwaters/2016%20Iowa%20Draft%20Methodology.pdf?ver=2017-04-11-134154-320
4a
All TMDLs need to result in attainment of all applicable water quality standards have been approved or established by EPA
"Methodology for Iowa’s 2016 Water Quality Assessment, Listing, and Reporting Pursuant to Sections 305(b) and 303(d) of the Federal Clean Water Act." at http://www.iowadnr.gov/Portals/idnr/uploads/watermonitoring/impairedwaters/2016%20Iowa%20Draft%20Methodology.pdf?ver=2017-04-11-134154-320
4b
Other required control measures are expected to result in the attainment of water quality standards in a reasonable period of time
"Methodology for Iowa’s 2016 Water Quality Assessment, Listing, and Reporting Pursuant to Sections 305(b) and 303(d) of the Federal Clean Water Act." at http://www.iowadnr.gov/Portals/idnr/uploads/watermonitoring/impairedwaters/2016%20Iowa%20Draft%20Methodology.pdf?ver=2017-04-11-134154-320
4c
The impairment or threat is not caused by a pollutant
"Methodology for Iowa’s 2016 Water Quality Assessment, Listing, and Reporting Pursuant to Sections 305(b) and 303(d) of the Federal Clean Water Act." at http://www.iowadnr.gov/Portals/idnr/uploads/watermonitoring/impairedwaters/2016%20Iowa%20Draft%20Methodology.pdf?ver=2017-04-11-134154-320
4d
Waterbody assessed as “impaired” due to a fish kill where enforcement action was taken to address the source of the kill: no TMDL required
"Methodology for Iowa’s 2016 Water Quality Assessment, Listing, and Reporting Pursuant to Sections 305(b) and 303(d) of the Federal Clean Water Act." at http://www.iowadnr.gov/Portals/idnr/uploads/watermonitoring/impairedwaters/2016%20Iowa%20Draft%20Methodology.pdf?ver=2017-04-11-134154-320
5*
Waterbody is impaired or threatened and a TMDL is needed
"Methodology for Iowa’s 2016 Water Quality Assessment, Listing, and Reporting Pursuant to Sections 305(b) and 303(d) of the Federal Clean Water Act." at http://www.iowadnr.gov/Portals/idnr/uploads/watermonitoring/impairedwaters/2016%20Iowa%20Draft%20Methodology.pdf?ver=2017-04-11-134154-320
5b
Impairment is based on results of a fish kill investigation or biological monitoring where specific causes and/or sources of the impairment have not yet been identified
"Methodology for Iowa’s 2016 Water Quality Assessment, Listing, and Reporting Pursuant to Sections 305(b) and 303(d) of the Federal Clean Water Act." at http://www.iowadnr.gov/Portals/idnr/uploads/watermonitoring/impairedwaters/2016%20Iowa%20Draft%20Methodology.pdf?ver=2017-04-11-134154-320
5b-t
[tentative]: The aquatic life uses of a stream segment with a watershed size within the calibration range of the IDNR biological assessment protocol (~10 to 500 square miles) are assessed as Section 303(d)-impaired based on an evaluated assessment. The reasons for residency in this subcategory include: 1) data quantity (only one of the two biological samples needed to identify an impairment have been collected), 2) data age (data older than five years), 3) data quality (marginal sampling conditions for biota), and 4) sampling frequency (multiple samples collected in same year, not multiple years)
"Methodology for Iowa’s 2016 Water Quality Assessment, Listing, and Reporting Pursuant to Sections 305(b) and 303(d) of the Federal Clean Water Act." at http://www.iowadnr.gov/Portals/idnr/uploads/watermonitoring/impairedwaters/2016%20Iowa%20Draft%20Methodology.pdf?ver=2017-04-11-134154-320
5b-v
[verified]: The aquatic life uses of a stream with a watershed size within the calibration range of IDNR biological assessment protocol (~10 to 500 square miles) are assessed as Section 303(d)-impaired based on results of the required two or more biological sampling events in multiple years within the previous five years needed to confirm the existence of a biological impairment
"Methodology for Iowa’s 2016 Water Quality Assessment, Listing, and Reporting Pursuant to Sections 305(b) and 303(d) of the Federal Clean Water Act." at http://www.iowadnr.gov/Portals/idnr/uploads/watermonitoring/impairedwaters/2016%20Iowa%20Draft%20Methodology.pdf?ver=2017-04-11-134154-320
5p
A presumptively-applied use is impaired. Most often applied to bacterial impairments of the presumptively applied Class A1 (primary contact recreation use)
"Methodology for Iowa’s 2016 Water Quality Assessment, Listing, and Reporting Pursuant to Sections 305(b) and 303(d) of the Federal Clean Water Act." at http://www.iowadnr.gov/Portals/idnr/uploads/watermonitoring/impairedwaters/2016%20Iowa%20Draft%20Methodology.pdf?ver=2017-04-11-134154-320
List
List
String
254
0
0
2016 Integrated Report List in which the waterbody segment and the listed impairment resides
305(b)
Category 4: Waterbody is impaired or threatened but a TMDL is not needed
Producer defined
303(d)
Category 5: Waterbody is impaired or threatened and a TMDL is needed
Producer defined
Producer defined
Impairment
Impairment
String
254
0
0
The cause or stressor responsible for the waterbody's impairment
Producer defined
ListingRat
ListingRat
String
254
0
0
Explanation as to why the waterbody has been categorized as impaired
Producer defined
DataSource
DataSource
String
254
0
0
Data sources used to assess water quality conditions for waterbody segment
Producer defined
TMDLPriori
TMDLPriori
String
254
0
0
• Prioritization and scheduling of waters for TMDL development. TMDLs are prioritized based on the relative social impacts/benefits and complexity levels of the TMDLs needed. The TMDL priority identified for a waterbody does not indicate, and has no relationship, to the relative severity of the impairment
https://www.iowadnr.gov/Portals/idnr/uploads/water/watershed/tmdl/files/planschedule.pdf
Tier 1
Priority Group 1. Impairments with relatively high social impact and a relatively low complexity & or cost for development
https://www.iowadnr.gov/Portals/idnr/uploads/water/watershed/tmdl/files/planschedule.pdf
Tier 2
Priority Group 2. Impairments with relatively high social impact and a relatively high complexity & or cost for development
https://www.iowadnr.gov/Portals/idnr/uploads/water/watershed/tmdl/files/planschedule.pdf
Tier 3
Priority Group 3. Impairments with relatively low social impact and a relatively low complexity & or cost for development
https://www.iowadnr.gov/Portals/idnr/uploads/water/watershed/tmdl/files/planschedule.pdf
Tier 4
Priority Group 4. Impairments with relatively low social impact and a relatively high complexity & or cost for development
https://www.iowadnr.gov/Portals/idnr/uploads/water/watershed/tmdl/files/planschedule.pdf
CycleListe
CycleListe
Integer
4
10
0
ImpStatus
ImpStatus
String
254
0
0
Status of impairment when comparing 2014 IR cycle to 2016 IR cycle
Producer defined
Continuing
No change in impairment since 2014 IR Cycle
Producer defined
New
New impairment during 2016 IR Cycle
Producer defined
20220415
Biennial
Daniel Kendall
Iowa Department of Natural Resources
Geologist 2 – Ambient Lake and Beach Monitoring Coordinator
[From Metadata Record] Daniel Kendall
[From Metadata Record] Daniel Kendall
Wallace State Office Building 502 E. 9th St
Des Moines
Iowa
50319
daniel.kendall@dnr.iowa.gov
US
515-725-8379
Andy Asell
Iowa Department of Natural Resources
Watershed Improvement Section - Geographic Information Systems Analyst
Wallace State Office Building 502 E. 9th St
Des Moines
Iowa
50319
andy.asell@dnr.iowa.gov
515-725-8386
BE800BB8-1CA8-46D5-B3FA-A4664FD2CF32